Sigma Persei (Sigma Per, σ Persei, σ Per) is an orange K-type giant[3] with an apparent magnitude of +4.36.[2] It is approximately 360 light years from Earth.[1]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 30m 34.48545s[1] |
| Declination | 47° 59′ 42.7808″[1] |
| Apparent magnitude (V) | 4.36[2] |
| Characteristics | |
| Spectral type | K3III[3] |
| U−B color index | +1.54[2] |
| B−V color index | +1.35[2] |
| Astrometry | |
| Radial velocity (Rv) | +14.36[4] km/s |
| Proper motion (μ) | RA: +3.56[1] mas/yr Dec.: +18.48[1] mas/yr |
| Parallax (π) | 9.07 ± 0.26 mas[1] |
| Distance | 360 ± 10 ly (110 ± 3 pc) |
| Absolute magnitude (MV) | -0.85[5] |
| Details | |
| Mass | 1.32[6] M☉ |
| Radius | 36.89[6] R☉ |
| Luminosity | 368[6] L☉ |
| Surface gravity (log g) | 1.46[6] cgs |
| Temperature | 4,165[6] K |
| Metallicity [Fe/H] | -0.20[6] dex |
| Rotational velocity (v sin i) | < 1.0[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Sigma Persei is moving through the Galaxy at a speed of 17.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,400 and 43,600 light years from the center of the Galaxy. It came closest to the Sun 5.1 million years ago when it had brightened to magnitude 3.11 from a distance of 202 light years.[8]
It has one reported planet, b, with a period of 580 days and a mass approximately 6.5 times that of Jupiter.[9]
Name and etymology
editThis star, together with δ Per, ψ Per, α Per, γ Per and η Per, has been called the Segment of Perseus.[10]
References
edit- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
- ^ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
- ^ a b c d e f Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. S2CID 59334290. Vizier catalog entry
- ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv:astro-ph/0608248. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
- ^ Sigma Persei (HIP 16335)
- ^ Lee, Byeong-Cheol; Han, Inwoo; Park, Myeong-Gu; Mkrtichian, David E.; Jeong, Gwanghui; Kim, Kang-Min; Valyavin, Gennady (2014). "PLANETARY COMPANION IN K GIANT σ PERSEI". Journal of the Korean Astronomical Society. 47 (2): 69. arXiv:1405.2130. Bibcode:2014JKAS...47...69L. doi:10.5303/JKAS.2014.47.2.69.
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 331. ISBN 0-486-21079-0. Retrieved 2012-09-04.